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Objective To increase stone - breaking efficiency by improving waterway system of extracorporeal shock wave lithotripsy.
目的:通过对体外冲击波碎石机水路系统改进提高碎石效率.
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Then they tried stone breaking in quarries, exposing themselves to seen and rain.
于是他们只能日晒雨淋地从事在采石场的碎石工作.
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